Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a37ad5ecdd2eff0887f9948d960524d4a72e7f7385f2950de3e029d950cd3c56' 
  AND token = 'jWYbmypgxaX4Q2ogzyEg4X6XH4mwCqBHkWMVWkvVPXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}